from rest_framework.views import exception_handler as drf_exception_handler
import logging
from django.db import DatabaseError
from redis.exceptions import RedisError
from rest_framework.response import Response
from rest_framework import status

# 获取在配置文件中定义的logger，用来记录日志
logger = logging.getLogger('django')


def exception_handler(exc, context):
    """
    自定义异常处理
    :param exc: 异常
    :param context:异常出现的上下文,就是异常所在的视图
    :return: Response响应对象
    """
    # 如果有异常, 先经过django的原生异常处理方法.
    response = drf_exception_handler(exc, context)
    # 异常未得到处理,执行一下操作
    if response is None:
        # 获取异常的上下文对象,即哪个视图抛出的异常
        view = context["view"]
        if isinstance(exc, DatabaseError) or isinstance(exc, RedisError):
            logger.error("[%s] %s" % (view, exc))
            # 向前端返回异常信息
            response = Response({'nessage': "服务器内部错误"}, status=status.HTTP_507_INSUFFICIENT_STORAGE)

        return response